CVE-2026-15748 Forminator Forms <= 1.56.1 - Unauthenticated Arbitrary File Upload via Forged Upload Field Configuration
Unauthenticated attackers can upload executable files via forged field configurations, leading to remote code execution on WordPress sites using Forminator Forms.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15748?
CVE-2026-15748 is a critical vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.
Weakness: CWE-434
Which versions are affected by CVE-2026-15748?
How do I fix CVE-2026-15748?
No fix has been published for CVE-2026-15748 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-15748 being exploited?
There is no known exploitation of CVE-2026-15748 in the wild and no public exploit code.
Public exploit code: 3 proofs of concept on GitHub.
Sources
Also known as GHSA-3p88-69p6-f6mj.